I vote for:
- a mini channel map (1/2 or 1/4 scale)
- a Dunkirk map
- a completely fictionnal map with a moutain, canyons and other rough terrain for races, barnstorming and stunt flying (but only if the current maps don't cover that, and I would consider this as the lowest priority). After all there such maps on IL2 and they were good fun to test pilot skills others than combat ones.
Thanks for asking us Luthier